Things that should work but doesn't.
Empty script elements
Problem
<script src="js/frontpage.js"/>
Using an empty script element validates
perfectly XHTML 1.0 strict, but messes up things seriously
in Internet Explorer and Mozilla Firefox - Opera is the only
one treating the web page correctly. IE and Mozilla does all
kinds of odd tings, not showing pictures (!) is one of them.
Fix
Use containing script elements although you
only use the src attribute:
<script src="js/frontpage.js"></script>